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<title>STABS: Typedefs</title>

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<a name="Typedefs"></a>
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<p>
Next: <a href="Unions.html#Unions" accesskey="n" rel="next">Unions</a>, Previous: <a href="Structures.html#Structures" accesskey="p" rel="prev">Structures</a>, Up: <a href="Types.html#Types" accesskey="u" rel="up">Types</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Symbol-Types-Index.html#Symbol-Types-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Giving-a-Type-a-Name"></a>
<h3 class="section">5.9 Giving a Type a Name</h3>

<a name="index-N_005fLSYM_002c-for-types"></a>
<a name="index-C_005fDECL_002c-for-types"></a>
<p>To give a type a name, use the &lsquo;<samp>t</samp>&rsquo; symbol descriptor.  The type
is specified by the type information (see <a href="String-Field.html#String-Field">String Field</a>) for the stab.
For example,
</p>
<div class="example">
<pre class="example">.stabs &quot;s_typedef:t16&quot;,128,0,0,0     # <span class="roman">128 is N_LSYM</span>
</pre></div>

<p>specifies that <code>s_typedef</code> refers to type number 16.  Such stabs
have symbol type <code>N_LSYM</code> (or <code>C_DECL</code> for XCOFF).  (The Sun
documentation mentions using <code>N_GSYM</code> in some cases).
</p>
<p>If you are specifying the tag name for a structure, union, or
enumeration, use the &lsquo;<samp>T</samp>&rsquo; symbol descriptor instead.  I believe C is
the only language with this feature.
</p>
<p>If the type is an opaque type (I believe this is a Modula-2 feature),
AIX provides a type descriptor to specify it.  The type descriptor is
&lsquo;<samp>o</samp>&rsquo; and is followed by a name.  I don&rsquo;t know what the name
means&mdash;is it always the same as the name of the type, or is this type
descriptor used with a nameless stab (see <a href="String-Field.html#String-Field">String Field</a>)?  There
optionally follows a comma followed by type information which defines
the type of this type.  If omitted, a semicolon is used in place of the
comma and the type information, and the type is much like a generic
pointer type&mdash;it has a known size but little else about it is
specified.
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